This was poor comfort. The Spider, at all events, had been clever enough to ensnare a private detective who prided himself on his astuteness. One trap had been set by Mr. Dimsdale, and here was another set by The Spider, out of which it was impossible to escape. The bars of the windows were too strong to twist, the door was too stout to break down, so there was nothing for it but to wait. It was impossible that he could be kept in his dungeon for ever, and sooner or later he would be released. Besides, someone would have to bring him food, and if it was the white-faced woman who had so cleverly led him into the trap, Vernon promised himself grimly that he would seize her at the first opportunity and make her aid his escape. Finally, the taxi was still at the door, and the driver might become sufficiently alarmed if his fare did not reappear to speak to the nearest policeman. It was ridiculous that a man should be captured in guarded London in such a way. Vernon was angry with himself for having been tricked. But until the abrupt closing of the door he had never suspected that anything was wrong. Meanwhile, he guessed that The Spider, having got him out of the way, was keeping his appointment with Dimsdale in the library. It was not probable that the blackmailing would succeed, as Dimsdale was quick-tempered, and as likely as not would simply seize the creature when he demanded his money, shouting meanwhile for assistance. Vernon wished that he was at his appointed post behind the screen; but he comforted with the reflection that Dimsdale would be able to deal with the matter unassisted. So far as he was concerned, being helpless, he could do nothing but wait.